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f046ccd1 | 1 | /* |
e857a5bd TT |
2 | * (C) Copyright 2000 |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
f046ccd1 EL |
6 | * |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of | |
10 | * the License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
20 | * MA 02111-1307 USA | |
f046ccd1 EL |
21 | */ |
22 | ||
23 | /* | |
24 | * This file handles the architecture-dependent parts of hardware | |
25 | * exceptions | |
26 | */ | |
27 | ||
28 | #include <common.h> | |
29 | #include <command.h> | |
e39bf1e2 | 30 | #include <kgdb.h> |
f046ccd1 EL |
31 | #include <asm/processor.h> |
32 | #include <asm/mpc8349_pci.h> | |
33 | ||
d87080b7 WD |
34 | DECLARE_GLOBAL_DATA_PTR; |
35 | ||
f046ccd1 EL |
36 | /* Returns 0 if exception not found and fixup otherwise. */ |
37 | extern unsigned long search_exception_table(unsigned long); | |
38 | ||
39 | #define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize) | |
40 | ||
41 | /* | |
42 | * Trap & Exception support | |
43 | */ | |
44 | ||
45 | void | |
46 | print_backtrace(unsigned long *sp) | |
47 | { | |
f046ccd1 EL |
48 | int cnt = 0; |
49 | unsigned long i; | |
50 | ||
51 | puts ("Call backtrace: "); | |
52 | while (sp) { | |
53 | if ((uint)sp > END_OF_MEM) | |
54 | break; | |
55 | ||
56 | i = sp[1]; | |
57 | if (cnt++ % 7 == 0) | |
58 | putc ('\n'); | |
59 | printf("%08lX ", i); | |
60 | if (cnt > 32) break; | |
61 | sp = (unsigned long *)*sp; | |
62 | } | |
63 | putc ('\n'); | |
64 | } | |
65 | ||
66 | void show_regs(struct pt_regs * regs) | |
67 | { | |
68 | int i; | |
69 | ||
70 | printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n", | |
71 | regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar); | |
72 | printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n", | |
73 | regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0, | |
74 | regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0, | |
75 | regs->msr&MSR_IR ? 1 : 0, | |
76 | regs->msr&MSR_DR ? 1 : 0); | |
77 | ||
78 | putc ('\n'); | |
79 | for (i = 0; i < 32; i++) { | |
80 | if ((i % 8) == 0) { | |
81 | printf("GPR%02d: ", i); | |
82 | } | |
83 | ||
84 | printf("%08lX ", regs->gpr[i]); | |
85 | if ((i % 8) == 7) { | |
86 | putc ('\n'); | |
87 | } | |
88 | } | |
89 | } | |
90 | ||
91 | ||
92 | void | |
93 | _exception(int signr, struct pt_regs *regs) | |
94 | { | |
95 | show_regs(regs); | |
96 | print_backtrace((unsigned long *)regs->gpr[1]); | |
97 | panic("Exception in kernel pc %lx signal %d",regs->nip,signr); | |
98 | } | |
99 | ||
100 | #ifdef CONFIG_PCI | |
101 | void dump_pci (void) | |
102 | { | |
103 | /* | |
6d0f6bcf | 104 | volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; |
f046ccd1 EL |
105 | printf ("PCI: err status %x err mask %x err ctrl %x\n", |
106 | le32_to_cpu (immap->im_pci.pci_esr), | |
107 | le32_to_cpu (immap->im_pci.pci_emr), | |
108 | le32_to_cpu (immap->im_pci.pci_ecr)); | |
109 | printf (" error address %x error data %x ctrl %x\n", | |
110 | le32_to_cpu (immap->im_pci.pci_eacr), | |
111 | le32_to_cpu (immap->im_pci.pci_edcr), | |
112 | le32_to_cpu (immap->im_pci.pci_eccr)); | |
113 | */ | |
114 | } | |
115 | #endif | |
116 | ||
117 | void | |
118 | MachineCheckException(struct pt_regs *regs) | |
119 | { | |
120 | unsigned long fixup; | |
121 | ||
122 | /* Probing PCI using config cycles cause this exception | |
123 | * when a device is not present. Catch it and return to | |
124 | * the PCI exception handler. | |
125 | */ | |
126 | #ifdef CONFIG_PCI | |
127 | #if 0 | |
6d0f6bcf | 128 | volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR; |
f046ccd1 EL |
129 | #ifdef DEBUG |
130 | dump_pci(); | |
131 | #endif | |
132 | /* clear the error in the error status register */ | |
133 | if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) { | |
134 | immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP); | |
135 | return; | |
136 | } | |
137 | #endif | |
138 | #endif /* CONFIG_PCI */ | |
139 | if ((fixup = search_exception_table(regs->nip)) != 0) { | |
140 | regs->nip = fixup; | |
141 | return; | |
142 | } | |
143 | ||
4431283c | 144 | #if defined(CONFIG_CMD_KGDB) |
f046ccd1 EL |
145 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
146 | return; | |
147 | #endif | |
148 | ||
149 | puts ("Machine check in kernel mode.\n" | |
150 | "Caused by (from msr): "); | |
151 | printf("regs %p ",regs); | |
152 | switch( regs->msr & 0x000F0000) { | |
153 | case (0x80000000>>12): | |
154 | puts ("Machine check signal - probably due to mm fault\n" | |
155 | "with mmu off\n"); | |
156 | break; | |
157 | case (0x80000000>>13): | |
158 | puts ("Transfer error ack signal\n"); | |
159 | break; | |
160 | case (0x80000000>>14): | |
161 | puts ("Data parity signal\n"); | |
162 | break; | |
163 | case (0x80000000>>15): | |
164 | puts ("Address parity signal\n"); | |
165 | break; | |
166 | default: | |
167 | puts ("Unknown values in msr\n"); | |
168 | } | |
169 | show_regs(regs); | |
170 | print_backtrace((unsigned long *)regs->gpr[1]); | |
171 | #ifdef CONFIG_PCI | |
172 | dump_pci(); | |
173 | #endif | |
174 | panic("machine check"); | |
175 | } | |
176 | ||
177 | void | |
178 | AlignmentException(struct pt_regs *regs) | |
179 | { | |
4431283c | 180 | #if defined(CONFIG_CMD_KGDB) |
f046ccd1 EL |
181 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
182 | return; | |
183 | #endif | |
184 | show_regs(regs); | |
185 | print_backtrace((unsigned long *)regs->gpr[1]); | |
186 | panic("Alignment Exception"); | |
187 | } | |
188 | ||
189 | void | |
190 | ProgramCheckException(struct pt_regs *regs) | |
191 | { | |
4431283c | 192 | #if defined(CONFIG_CMD_KGDB) |
f046ccd1 EL |
193 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
194 | return; | |
195 | #endif | |
196 | show_regs(regs); | |
197 | print_backtrace((unsigned long *)regs->gpr[1]); | |
198 | panic("Program Check Exception"); | |
199 | } | |
200 | ||
201 | void | |
202 | SoftEmuException(struct pt_regs *regs) | |
203 | { | |
4431283c | 204 | #if defined(CONFIG_CMD_KGDB) |
f046ccd1 EL |
205 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
206 | return; | |
207 | #endif | |
208 | show_regs(regs); | |
209 | print_backtrace((unsigned long *)regs->gpr[1]); | |
210 | panic("Software Emulation Exception"); | |
211 | } | |
212 | ||
213 | ||
214 | void | |
215 | UnknownException(struct pt_regs *regs) | |
216 | { | |
4431283c | 217 | #if defined(CONFIG_CMD_KGDB) |
f046ccd1 EL |
218 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
219 | return; | |
220 | #endif | |
221 | printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", | |
222 | regs->nip, regs->msr, regs->trap); | |
223 | _exception(0, regs); | |
224 | } | |
225 | ||
4431283c | 226 | #if defined(CONFIG_CMD_BEDBUG) |
f046ccd1 EL |
227 | extern void do_bedbug_breakpoint(struct pt_regs *); |
228 | #endif | |
229 | ||
230 | void | |
231 | DebugException(struct pt_regs *regs) | |
232 | { | |
233 | printf("Debugger trap at @ %lx\n", regs->nip ); | |
234 | show_regs(regs); | |
4431283c | 235 | #if defined(CONFIG_CMD_BEDBUG) |
f046ccd1 EL |
236 | do_bedbug_breakpoint( regs ); |
237 | #endif | |
238 | } | |
239 | ||
240 | /* Probe an address by reading. If not present, return -1, otherwise | |
241 | * return 0. | |
242 | */ | |
243 | int | |
244 | addr_probe(uint *addr) | |
245 | { | |
246 | #if 0 | |
247 | int retval; | |
248 | ||
249 | __asm__ __volatile__( \ | |
250 | "1: lwz %0,0(%1)\n" \ | |
251 | " eieio\n" \ | |
252 | " li %0,0\n" \ | |
253 | "2:\n" \ | |
254 | ".section .fixup,\"ax\"\n" \ | |
255 | "3: li %0,-1\n" \ | |
256 | " b 2b\n" \ | |
257 | ".section __ex_table,\"a\"\n" \ | |
258 | " .align 2\n" \ | |
259 | " .long 1b,3b\n" \ | |
260 | ".text" \ | |
261 | : "=r" (retval) : "r"(addr)); | |
262 | ||
263 | return (retval); | |
264 | #endif | |
265 | return 0; | |
266 | } |